protests in egypt today after the new controversial constitution criticizes the power grab by president mohammed morsi is approved. he's expected to sign the document saturday but not the end of the conflict. the egyptian constitution needs to be approved by citizens many of whom are still angry at the moressy government. >>> nasa said it has found large deposits of ice on mercury. some areas of mercury can reach 800 degrees fahrenheit, some areas are completely shielded from the sun allowing the ice to form. nasa plans to send its messenger spacecraft to that area for a closer look in the coming months. >>> groundbreaking therapy is under way to help patients who suffer from posttramatic stress disorder. what's revolutionary about the work is the use of an illegal drug commonly referred to as ecstasy, our chief medical correspondent dr. sanjay gupta has had exclusive access to the patients and their sessions. here's his report -- >> some part of you is on guard. it just wouldn't stop. i couldn't shut it down. >> reporter: for rachel hope, the mental agony began in childhood when she sa